A pivotal early scene features a verbal joust, in Latin, between desperado outlaw Johnny Ringo and gunfighter-turned-lawman Doc Holliday. Each man despises the other, in part because of the similarities in education, attitude, and skill. Prior to the exchange, Holliday says he hates Ringo because he reminds him of himself.
Ringo states “age quod agis” during the confrontation, which is interpreted by Holliday as both a warning and an insult. The phrase has multiple meanings and interpretations depending on the circumstances in which it is used. In terms of a man of greatness, the phrase means “do it with all of yourself; do what you do best, and do it well.” Take this as a directive, and live your life in accordance with its spirit. You may not be a famous gunfighter but you can become a great man by heeding the words of one.
From September 2010, http://raising-a-man.tumblr.com